package com.xspace.android.xafview.zxing.file;

import android.graphics.Bitmap;

import com.google.zxing.LuminanceSource;

public class BitmapLuance extends LuminanceSource{

	private byte[] bitmapPixels;

	protected BitmapLuance(Bitmap bitmap){
		
			super(bitmap.getWidth(), bitmap.getHeight());

			// 首先，要取得该图片的像素数组内容
			int[] data = new int[bitmap.getWidth() * bitmap.getHeight()];
			this.bitmapPixels = new byte[bitmap.getWidth() * bitmap.getHeight()];
			bitmap.getPixels(data, 0, getWidth(), 0, 0, getWidth(), getHeight());

			// 将int数组转换为byte数组
			for (int i = 0; i < data.length; i++) {
				this.bitmapPixels[i] = (byte) data[i];
			}
	}
	@Override
	public byte[] getMatrix() {
		 // 返回我们生成好的像素数据
		return bitmapPixels;
	}

	@Override
	public byte[] getRow(int y, byte[] row) {
		// 这里要得到指定行的像素数据  
		 System.arraycopy(bitmapPixels, y * getWidth(), row, 0, getWidth()); 
		return row;
	}

}
